# Data structure

## Pool

```
    #[resource_group_member(group = aptos_framework::object::ObjectGroup)]
    struct LiquidityPoolV3 has key {
        token_a_liquidity: Object<FungibleStore>,
        token_b_liquidity: Object<FungibleStore>,
        token_a_fee: Object<FungibleStore>,
        token_b_fee: Object<FungibleStore>,
        // the current price
        sqrt_price: u128,
        // liquidity current tick
        liquidity: u128,
        // the current tick
        tick: I32,
        // the most-recently updated index of the observations array
        observation_index: u64,
        // the current maximum number of observations that are being stored
        observation_cardinality: u64,
        // the next maximum number of observations to store, triggered in observations.write
        observation_cardinality_next: u64,
        /// The numerator of fee rate, the denominator is 1_000_000.
        fee_rate: u64,
        // the current protocol fee as a percentage of the swap fee taken on withdrawal
        // the denominator is 1_000_000.
        fee_protocol: u64,
        // whether the pool is locked
        unlocked: bool,
        fee_growth_global_a: u128,
        fee_growth_global_b: u128,
        seconds_per_liquidity_oracle: u128,
        seconds_per_liquidity_incentive: u128,
        position_blacklist: PositionBlackList,
        last_update_timestamp: u64,
        tick_info: SmartTable<I32, TickInfo>,
        tick_map: BitMap,
        tick_spacing: u32,
        protocol_fees: ProtocolFees,
        lp_token_refs: LPTokenRefs,
        max_liquidity_per_tick: u128,
        rewarder_manager: RewarderManager
    }

```

## Position

```
    #[resource_group_member(group = aptos_framework::object::ObjectGroup)]
    struct Info has key {
        // whether inited after migration
        initialized: bool,
        // the amount of liquidity owned by this position
        liquidity: u128,
        tick_lower: I32,
        tick_upper: I32,
        // fee growth per unit of liquidity as of the last update to liquidity or fees owed
        fee_growth_inside_a_last: u128,
        fee_growth_inside_b_last: u128,
        // the fees owed to the position owner in token0/token1
        fee_owed_a: u64,
        fee_owed_b: u64,
        token_a: Object<Metadata>,
        token_b: Object<Metadata>,
        fee_tier: u8,
        rewards: vector<PositionReward>,
    }

```

## Rewarder

```
 struct RewarderManager has store {
        rewarders: vector<Rewarder>,
        last_updated_time: u64,
        pause: bool
    }

    struct Rewarder has copy, drop, store {
        reward_store: Object<FungibleStore>,
        emissions_per_second: u64,
        emissions_per_second_max: u64,
        emissions_per_liquidity_start: u128,
        emissions_per_liquidity_latest: u128,
        user_owed: u64,
        pause: bool
    }

    /// The Position's rewarder record
    struct PositionReward has drop, copy, store {
        emissions_per_liquidity_inside: u128,
        amount_owned: u64,
    }

```

<sub>The White Paper is for informational purposes only. Nothing in the White Paper constitutes legal, financial or tax advice. Its content may be updated from time to time without express notice. You should seek your own professional advice before engaging in any activity in connection with Hyperion. See</sub> [<sub>Legal Disclaimer</sub>](https://docs.hyperion.xyz/legal-and-compliance/legal-disclaimer)<sub>.</sub>


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